How To Fix CMPERS128 - Internal error: Conversion of internal to external format failed

SAP Error Message - Details

• Message type: E = Error

• Message class: CMPERS - Personalization for Web Applications

• Message number: 128

• Message text: Internal error: Conversion of internal to external format failed

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CMPERS128 - Internal error: Conversion of internal to external format failed ?

  The SAP error message CMPERS128, which states "Internal error: Conversion of internal to external format failed," typically occurs during the conversion of data formats within the SAP system. This error can arise in various contexts, such as when dealing with personnel data, date formats, or other data conversions.
  Causes:
  
  Data Format Issues: The internal representation of data does not match the expected external format. This can happen if the data is corrupted or if there are inconsistencies in the data types.
  Configuration Errors: Incorrect configuration settings in the system can lead to issues in data conversion.
  Missing or Incorrect Data: If required fields are missing or contain invalid data, the conversion process may fail.
  Custom Code or Enhancements: If there are custom programs or enhancements that manipulate data, they may not handle conversions correctly.
  System Bugs: Occasionally, this error can be caused by bugs in the SAP system itself, particularly if you are using an older version.
  
  Solutions:
  
  Check Data Integrity: Review the data being processed to ensure that it is complete and correctly formatted. Look for any anomalies or inconsistencies.
  Review Configuration Settings: Ensure that the configuration settings related to data formats (e.g., date formats, number formats) are correctly set up in the system.
  Debugging: If you have access to debugging tools, you can trace the execution of the program to identify where the conversion is failing.
  Check for Custom Code: If there are any custom developments, review the code to ensure that it correctly handles data conversions.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes or patches that address this specific error. Sometimes, SAP releases updates that fix known issues.
  Contact SAP Support: If the issue persists and you cannot identify the cause, consider reaching out to SAP Support for assistance.
  
  Related Information:
  
  Transaction Codes: You may want to check transaction codes like SE11 (Data Dictionary), SE37 (Function Modules), or SE80 (Object Navigator) to investigate the data structures and function modules involved in the conversion process.
  Logs and Traces: Review system logs (transaction SLG1) and short dumps (transaction ST22) for additional error messages or context that may help diagnose the issue.
  User Exits and BAdIs: If applicable, check for any user exits or Business Add-Ins (BAdIs) that might be influencing the data conversion process.
  
  By following these steps, you should be able to identify the root cause of the CMPERS128 error and implement a suitable solution.